bsd/miscfs/devfs/devfs_vfsops.c

   1 /*
   2  * Copyright (c) 2000-2010 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*-
  29  * Copyright 1997,1998 Julian Elischer.  All rights reserved.
  30  * julian@freebsd.org
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions are
  34  * met:
  35  *  1. Redistributions of source code must retain the above copyright
  36  *     notice, this list of conditions and the following disclaimer.
  37  *  2. Redistributions in binary form must reproduce the above copyright notice,
  38  *     this list of conditions and the following disclaimer in the documentation
  39  *     and/or other materials provided with the distribution.
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER ``AS IS'' AND ANY EXPRESS
  42  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  43  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  44  * DISCLAIMED.  IN NO EVENT SHALL THE HOLDER OR CONTRIBUTORS BE LIABLE FOR
  45  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  47  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  48  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * devfs_vfsops.c
  54  *
  55  */
  56 /*
  57  * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
  58  * support for mandatory and extensible security protections.  This notice
  59  * is included in support of clause 2.2 (b) of the Apple Public License,
  60  * Version 2.0.
  61  */
  62 /*
  63  * HISTORY
  64  *  Dieter Siegmund (dieter@apple.com) Wed Jul 14 13:37:59 PDT 1999
  65  *  - modified devfs_statfs() to use devfs_stats to calculate the
  66  *    amount of memory used by devfs
  67  */
  68
  69
  70 #include <sys/param.h>
  71 #include <sys/systm.h>
  72 #include <sys/kernel.h>
  73 #include <sys/vnode_internal.h>
  74 #include <sys/proc.h>
  75 #include <sys/kauth.h>
  76 #include <sys/mount_internal.h>
  77 #include <sys/malloc.h>
  78
  79 #include <libkern/OSAtomic.h>
  80
  81 #if CONFIG_MACF
  82 #include <security/mac_framework.h>
  83 #endif
  84
  85 #include "devfs.h"
  86 #include "devfsdefs.h"
  87
  88 #if FDESC
  89 #include "fdesc.h"
  90 #endif /* FDESC */
  91
  92
  93 static int devfs_statfs( struct mount *mp, struct vfsstatfs *sbp, vfs_context_t ctx);
  94 static int devfs_vfs_getattr(mount_t mp, struct vfs_attr *fsap, vfs_context_t ctx);
  95
  96 #if !defined(SECURE_KERNEL)
  97 extern int setup_kmem;
  98 __private_extern__ void devfs_setup_kmem(void);
  99 #endif
 100
 101 /*-
 102  * Called from the generic VFS startups.
 103  * This is the second stage of DEVFS initialisation.
 104  * The probed devices have already been loaded and the
 105  * basic structure of the DEVFS created.
 106  * We take the oportunity to mount the hidden DEVFS layer, so that
 107  * devices from devfs get sync'd.
 108  */
 109 static int
 110 devfs_init(__unused struct vfsconf *vfsp)
 111 {
 112     if (devfs_sinit())
 113         return (ENOTSUP);
 114     devfs_make_node(makedev(0, 0), DEVFS_CHAR,
 115                     UID_ROOT, GID_WHEEL, 0622, "console");
 116     devfs_make_node(makedev(2, 0), DEVFS_CHAR,
 117                     UID_ROOT, GID_WHEEL, 0666, "tty");
 118 #if !defined(SECURE_KERNEL)
 119     if (setup_kmem) {
 120         devfs_setup_kmem();
 121     }
 122 #endif
 123     devfs_make_node(makedev(3, 2), DEVFS_CHAR,
 124                     UID_ROOT, GID_WHEEL, 0666, "null");
 125     devfs_make_node(makedev(3, 3), DEVFS_CHAR,
 126                     UID_ROOT, GID_WHEEL, 0666, "zero");
 127     devfs_make_node(makedev(6, 0), DEVFS_CHAR,
 128                     UID_ROOT, GID_WHEEL, 0600, "klog");
 129
 130 #if  FDESC
 131     devfs_fdesc_init();
 132 #endif
 133
 134     return 0;
 135 }
 136
 137 #if !defined(SECURE_KERNEL)
 138 __private_extern__ void
 139 devfs_setup_kmem(void)
 140 {
 141         devfs_make_node(makedev(3, 0), DEVFS_CHAR,
 142                     UID_ROOT, GID_KMEM, 0640, "mem");
 143         devfs_make_node(makedev(3, 1), DEVFS_CHAR,
 144                     UID_ROOT, GID_KMEM, 0640, "kmem");
 145 }
 146 #endif
 147
 148
 149 /*-
 150  *  mp   - pointer to 'mount' structure
 151  *  path - addr in user space of mount point (ie /usr or whatever)
 152  *  data - addr in user space of mount params including the
 153  *         name of the block special file to treat as a filesystem.
 154  *         (NOT USED)
 155  *  ndp  - namei data pointer (NOT USED)
 156  *  p    - proc pointer
 157  * devfs is special in that it doesn't require any device to be mounted..
 158  * It makes up its data as it goes along.
 159  * it must be mounted during single user.. until it is, only std{in/out/err}
 160  * and the root filesystem are available.
 161  */
 162 /*proto*/
 163 int
 164 devfs_mount(struct mount *mp, __unused vnode_t devvp, __unused user_addr_t data, vfs_context_t ctx)
 165 {
 166         struct devfsmount *devfs_mp_p;  /* devfs specific mount info */
 167         int error;
 168
 169         /*-
 170          *  If they just want to update, we don't need to do anything.
 171          */
 172         if (mp->mnt_flag & MNT_UPDATE)
 173         {
 174                 return 0;
 175         }
 176
 177         /* Advisory locking should be handled at the VFS layer */
 178         vfs_setlocklocal(mp);
 179
 180         /*-
 181          *  Well, it's not an update, it's a real mount request.
 182          *  Time to get dirty.
 183          * HERE we should check to see if we are already mounted here.
 184          */
 185
 186         MALLOC(devfs_mp_p, struct devfsmount *, sizeof(struct devfsmount),
 187                M_DEVFSMNT, M_WAITOK);
 188         if (devfs_mp_p == NULL)
 189                 return (ENOMEM);
 190         bzero(devfs_mp_p,sizeof(*devfs_mp_p));
 191         devfs_mp_p->mount = mp;
 192
 193         /*-
 194          *  Fill out some fields
 195          */
 196         mp->mnt_data = (qaddr_t)devfs_mp_p;
 197         mp->mnt_vfsstat.f_fsid.val[0] = (int32_t)(uintptr_t)devfs_mp_p;
 198         mp->mnt_vfsstat.f_fsid.val[1] = vfs_typenum(mp);
 199         mp->mnt_flag |= MNT_LOCAL;
 200
 201         DEVFS_LOCK();
 202         error = dev_dup_plane(devfs_mp_p);
 203         DEVFS_UNLOCK();
 204
 205         if (error) {
 206                 mp->mnt_data = (qaddr_t)0;
 207                 FREE((caddr_t)devfs_mp_p, M_DEVFSMNT);
 208                 return (error);
 209         } else
 210                 DEVFS_INCR_MOUNTS();
 211
 212         /*-
 213          *  Copy in the name of the directory the filesystem
 214          *  is to be mounted on.
 215          *  And we clear the remainder of the character strings
 216          *  to be tidy.
 217          */
 218
 219         bzero(mp->mnt_vfsstat.f_mntfromname, MAXPATHLEN);
 220         bcopy("devfs",mp->mnt_vfsstat.f_mntfromname, 5);
 221         (void)devfs_statfs(mp, &mp->mnt_vfsstat, ctx);
 222
 223         return 0;
 224 }
 225
 226
 227 static int
 228 devfs_start(__unused struct mount *mp, __unused int flags, __unused vfs_context_t ctx)
 229 {
 230         return 0;
 231 }
 232
 233 /*-
 234  *  Unmount the filesystem described by mp.
 235  */
 236 static int
 237 devfs_unmount( struct mount *mp, int mntflags, __unused vfs_context_t ctx)
 238 {
 239         struct devfsmount *devfs_mp_p = (struct devfsmount *)mp->mnt_data;
 240         int flags = 0;
 241         int force = 0;
 242         int error;
 243
 244         if (mntflags & MNT_FORCE) {
 245                 flags |= FORCECLOSE;
 246                 force = 1;
 247         }
 248         error = vflush(mp, NULLVP, flags);
 249         if (error && !force)
 250                 return error;
 251
 252         DEVFS_LOCK();
 253         devfs_free_plane(devfs_mp_p);
 254         DEVFS_UNLOCK();
 255
 256         DEVFS_DECR_MOUNTS();
 257
 258         FREE((caddr_t)devfs_mp_p, M_DEVFSMNT);
 259         mp->mnt_data = (qaddr_t)0;
 260         mp->mnt_flag &= ~MNT_LOCAL;
 261
 262         return 0;
 263 }
 264
 265 /* return the address of the root vnode  in *vpp */
 266 static int
 267 devfs_root(struct mount *mp, struct vnode **vpp, __unused vfs_context_t ctx)
 268 {
 269         struct devfsmount *devfs_mp_p = (struct devfsmount *)(mp->mnt_data);
 270         int error;
 271
 272         DEVFS_LOCK();
 273         /* last parameter to devfs_dntovn() is ignored */
 274         error = devfs_dntovn(devfs_mp_p->plane_root->de_dnp, vpp, NULL);
 275         DEVFS_UNLOCK();
 276
 277         return error;
 278 }
 279
 280 static int
 281 devfs_statfs( struct mount *mp, struct vfsstatfs *sbp, __unused vfs_context_t ctx)
 282 {
 283         struct devfsmount *devfs_mp_p = (struct devfsmount *)mp->mnt_data;
 284
 285         /*-
 286          *  Fill in the stat block.
 287          */
 288         //sbp->f_type   = mp->mnt_vfsstat.f_type;
 289         sbp->f_flags  = 0;              /* XXX */
 290         sbp->f_bsize  = 512;
 291         sbp->f_iosize = 512;
 292         sbp->f_blocks = (devfs_stats.mounts * sizeof(struct devfsmount)
 293                          + devfs_stats.nodes * sizeof(devnode_t)
 294                          + devfs_stats.entries * sizeof(devdirent_t)
 295                          + devfs_stats.stringspace
 296                          ) / sbp->f_bsize;
 297         sbp->f_bfree  = 0;
 298         sbp->f_bavail = 0;
 299         sbp->f_files  = devfs_stats.nodes;
 300         sbp->f_ffree  = 0;
 301         sbp->f_fsid.val[0] = (int32_t)(uintptr_t)devfs_mp_p;
 302         sbp->f_fsid.val[1] = vfs_typenum(mp);
 303
 304         return 0;
 305 }
 306
 307 static int
 308 devfs_vfs_getattr(__unused mount_t mp, struct vfs_attr *fsap, __unused vfs_context_t ctx)
 309 {
 310         VFSATTR_RETURN(fsap, f_objcount, devfs_stats.nodes);
 311         VFSATTR_RETURN(fsap, f_maxobjcount, devfs_stats.nodes);
 312         VFSATTR_RETURN(fsap, f_bsize, 512);
 313         VFSATTR_RETURN(fsap, f_iosize, 512);
 314         if (VFSATTR_IS_ACTIVE(fsap, f_blocks) || VFSATTR_IS_ACTIVE(fsap, f_bused)) {
 315                 fsap->f_blocks = (devfs_stats.mounts * sizeof(struct devfsmount)
 316                          + devfs_stats.nodes * sizeof(devnode_t)
 317                          + devfs_stats.entries * sizeof(devdirent_t)
 318                          + devfs_stats.stringspace
 319                          ) / fsap->f_bsize;
 320                 fsap->f_bused = fsap->f_blocks;
 321                 VFSATTR_SET_SUPPORTED(fsap, f_blocks);
 322                 VFSATTR_SET_SUPPORTED(fsap, f_bused);
 323         }
 324         VFSATTR_RETURN(fsap, f_bfree, 0);
 325         VFSATTR_RETURN(fsap, f_bavail, 0);
 326         VFSATTR_RETURN(fsap, f_files, devfs_stats.nodes);
 327         VFSATTR_RETURN(fsap, f_ffree, 0);
 328         VFSATTR_RETURN(fsap, f_fssubtype, 0);
 329
 330         if (VFSATTR_IS_ACTIVE(fsap, f_capabilities)) {
 331                 fsap->f_capabilities.capabilities[VOL_CAPABILITIES_FORMAT] =
 332                         VOL_CAP_FMT_SYMBOLICLINKS |
 333                         VOL_CAP_FMT_HARDLINKS |
 334                         VOL_CAP_FMT_NO_ROOT_TIMES |
 335                         VOL_CAP_FMT_CASE_SENSITIVE |
 336                         VOL_CAP_FMT_CASE_PRESERVING |
 337                         VOL_CAP_FMT_FAST_STATFS |
 338                         VOL_CAP_FMT_2TB_FILESIZE |
 339                         VOL_CAP_FMT_HIDDEN_FILES;
 340                 fsap->f_capabilities.capabilities[VOL_CAPABILITIES_INTERFACES] =
 341                         VOL_CAP_INT_ATTRLIST ;
 342                 fsap->f_capabilities.capabilities[VOL_CAPABILITIES_RESERVED1] = 0;
 343                 fsap->f_capabilities.capabilities[VOL_CAPABILITIES_RESERVED2] = 0;
 344
 345                 fsap->f_capabilities.valid[VOL_CAPABILITIES_FORMAT] =
 346                         VOL_CAP_FMT_PERSISTENTOBJECTIDS |
 347                         VOL_CAP_FMT_SYMBOLICLINKS |
 348                         VOL_CAP_FMT_HARDLINKS |
 349                         VOL_CAP_FMT_JOURNAL |
 350                         VOL_CAP_FMT_JOURNAL_ACTIVE |
 351                         VOL_CAP_FMT_NO_ROOT_TIMES |
 352                         VOL_CAP_FMT_SPARSE_FILES |
 353                         VOL_CAP_FMT_ZERO_RUNS |
 354                         VOL_CAP_FMT_CASE_SENSITIVE |
 355                         VOL_CAP_FMT_CASE_PRESERVING |
 356                         VOL_CAP_FMT_FAST_STATFS |
 357                         VOL_CAP_FMT_2TB_FILESIZE |
 358                         VOL_CAP_FMT_OPENDENYMODES |
 359                         VOL_CAP_FMT_HIDDEN_FILES |
 360                         VOL_CAP_FMT_PATH_FROM_ID |
 361                         VOL_CAP_FMT_NO_VOLUME_SIZES;
 362                 fsap->f_capabilities.valid[VOL_CAPABILITIES_INTERFACES] =
 363                         VOL_CAP_INT_SEARCHFS |
 364                         VOL_CAP_INT_ATTRLIST |
 365                         VOL_CAP_INT_NFSEXPORT |
 366                         VOL_CAP_INT_READDIRATTR |
 367                         VOL_CAP_INT_EXCHANGEDATA |
 368                         VOL_CAP_INT_COPYFILE |
 369                         VOL_CAP_INT_ALLOCATE |
 370                         VOL_CAP_INT_VOL_RENAME |
 371                         VOL_CAP_INT_ADVLOCK |
 372                         VOL_CAP_INT_FLOCK |
 373                         VOL_CAP_INT_EXTENDED_SECURITY |
 374                         VOL_CAP_INT_USERACCESS |
 375                         VOL_CAP_INT_MANLOCK |
 376                         VOL_CAP_INT_EXTENDED_ATTR |
 377                         VOL_CAP_INT_NAMEDSTREAMS;
 378                 fsap->f_capabilities.valid[VOL_CAPABILITIES_RESERVED1] = 0;
 379                 fsap->f_capabilities.valid[VOL_CAPABILITIES_RESERVED2] = 0;
 380
 381                 VFSATTR_SET_SUPPORTED(fsap, f_capabilities);
 382         }
 383
 384         if (VFSATTR_IS_ACTIVE(fsap, f_attributes)) {
 385                 fsap->f_attributes.validattr.commonattr =
 386                         ATTR_CMN_NAME | ATTR_CMN_DEVID | ATTR_CMN_FSID |
 387                         ATTR_CMN_OBJTYPE | ATTR_CMN_OBJTAG | ATTR_CMN_OBJID |
 388                         ATTR_CMN_PAROBJID |
 389                         ATTR_CMN_MODTIME | ATTR_CMN_CHGTIME | ATTR_CMN_ACCTIME |
 390                         ATTR_CMN_OWNERID | ATTR_CMN_GRPID | ATTR_CMN_ACCESSMASK |
 391                         ATTR_CMN_FLAGS | ATTR_CMN_USERACCESS | ATTR_CMN_FILEID;
 392                 fsap->f_attributes.validattr.volattr =
 393                         ATTR_VOL_FSTYPE | ATTR_VOL_SIZE | ATTR_VOL_SPACEFREE |
 394                         ATTR_VOL_SPACEAVAIL | ATTR_VOL_MINALLOCATION |
 395                         ATTR_VOL_OBJCOUNT | ATTR_VOL_MAXOBJCOUNT |
 396                         ATTR_VOL_MOUNTPOINT | ATTR_VOL_MOUNTFLAGS |
 397                         ATTR_VOL_MOUNTEDDEVICE | ATTR_VOL_CAPABILITIES |
 398                         ATTR_VOL_ATTRIBUTES;
 399                 fsap->f_attributes.validattr.dirattr =
 400                         ATTR_DIR_LINKCOUNT | ATTR_DIR_MOUNTSTATUS;
 401                 fsap->f_attributes.validattr.fileattr =
 402                         ATTR_FILE_LINKCOUNT | ATTR_FILE_TOTALSIZE |
 403                         ATTR_FILE_IOBLOCKSIZE | ATTR_FILE_DEVTYPE |
 404                         ATTR_FILE_DATALENGTH;
 405                 fsap->f_attributes.validattr.forkattr = 0;
 406
 407                 fsap->f_attributes.nativeattr.commonattr =
 408                         ATTR_CMN_NAME | ATTR_CMN_DEVID | ATTR_CMN_FSID |
 409                         ATTR_CMN_OBJTYPE | ATTR_CMN_OBJTAG | ATTR_CMN_OBJID |
 410                         ATTR_CMN_PAROBJID |
 411                         ATTR_CMN_MODTIME | ATTR_CMN_CHGTIME | ATTR_CMN_ACCTIME |
 412                         ATTR_CMN_OWNERID | ATTR_CMN_GRPID | ATTR_CMN_ACCESSMASK |
 413                         ATTR_CMN_FLAGS | ATTR_CMN_USERACCESS | ATTR_CMN_FILEID;
 414                 fsap->f_attributes.nativeattr.volattr =
 415                         ATTR_VOL_FSTYPE | ATTR_VOL_SIZE | ATTR_VOL_SPACEFREE |
 416                         ATTR_VOL_SPACEAVAIL | ATTR_VOL_MINALLOCATION |
 417                         ATTR_VOL_OBJCOUNT | ATTR_VOL_MAXOBJCOUNT |
 418                         ATTR_VOL_MOUNTPOINT | ATTR_VOL_MOUNTFLAGS |
 419                         ATTR_VOL_MOUNTEDDEVICE | ATTR_VOL_CAPABILITIES |
 420                         ATTR_VOL_ATTRIBUTES;
 421                 fsap->f_attributes.nativeattr.dirattr =
 422                         ATTR_DIR_MOUNTSTATUS;
 423                 fsap->f_attributes.nativeattr.fileattr =
 424                         ATTR_FILE_LINKCOUNT | ATTR_FILE_TOTALSIZE |
 425                         ATTR_FILE_IOBLOCKSIZE | ATTR_FILE_DEVTYPE |
 426                         ATTR_FILE_DATALENGTH;
 427                 fsap->f_attributes.nativeattr.forkattr = 0;
 428
 429                 VFSATTR_SET_SUPPORTED(fsap, f_attributes);
 430         }
 431
 432         return 0;
 433 }
 434
 435 static int
 436 devfs_sync(__unused struct mount *mp, __unused int waitfor, __unused vfs_context_t ctx)
 437 {
 438     return (0);
 439 }
 440
 441
 442 static int
 443 devfs_vget(__unused struct mount *mp, __unused ino64_t ino, __unused struct vnode **vpp, __unused vfs_context_t ctx)
 444 {
 445         return ENOTSUP;
 446 }
 447
 448 /*************************************************************
 449  * The concept of exporting a kernel generated devfs is stupid
 450  * So don't handle filehandles
 451  */
 452
 453 static int
 454 devfs_fhtovp (__unused struct mount *mp, __unused int fhlen, __unused unsigned char *fhp, __unused struct vnode **vpp, __unused vfs_context_t ctx)
 455 {
 456         return (EINVAL);
 457 }
 458
 459
 460 static int
 461 devfs_vptofh (__unused struct vnode *vp, __unused int *fhlenp, __unused unsigned char *fhp, __unused vfs_context_t ctx)
 462 {
 463         return (EINVAL);
 464 }
 465
 466 static int
 467 devfs_sysctl(__unused int *name, __unused u_int namelen, __unused user_addr_t oldp,
 468              __unused size_t *oldlenp, __unused user_addr_t newp,
 469              __unused size_t newlen, __unused vfs_context_t ctx)
 470 {
 471     return (ENOTSUP);
 472 }
 473
 474 #include <sys/namei.h>
 475
 476 /*
 477  * Function: devfs_kernel_mount
 478  * Purpose:
 479  *   Mount devfs at the given mount point from within the kernel.
 480  */
 481 int
 482 devfs_kernel_mount(char * mntname)
 483 {
 484         struct mount *mp;
 485         int error;
 486         struct nameidata nd;
 487         struct vnode  * vp;
 488         vfs_context_t ctx = vfs_context_kernel();
 489         struct vfstable *vfsp;
 490
 491         /* Find our vfstable entry */
 492         for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
 493                 if (!strncmp(vfsp->vfc_name, "devfs", sizeof(vfsp->vfc_name)))
 494                         break;
 495
 496         if (!vfsp) {
 497                 panic("Could not find entry in vfsconf for devfs.\n");
 498         }
 499
 500         /*
 501          * Get vnode to be covered
 502          */
 503         NDINIT(&nd, LOOKUP, OP_MOUNT, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
 504             CAST_USER_ADDR_T(mntname), ctx);
 505         if ((error = namei(&nd))) {
 506             printf("devfs_kernel_mount: failed to find directory '%s', %d\n",
 507                    mntname, error);
 508             return (error);
 509         }
 510         nameidone(&nd);
 511         vp = nd.ni_vp;
 512
 513         if ((error = VNOP_FSYNC(vp, MNT_WAIT, ctx))) {
 514             printf("devfs_kernel_mount: vnop_fsync failed: %d\n", error);
 515             vnode_put(vp);
 516             return (error);
 517         }
 518         if ((error = buf_invalidateblks(vp, BUF_WRITE_DATA, 0, 0))) {
 519             printf("devfs_kernel_mount: buf_invalidateblks failed: %d\n", error);
 520             vnode_put(vp);
 521             return (error);
 522         }
 523         if (vnode_isdir(vp) == 0) {
 524             printf("devfs_kernel_mount: '%s' is not a directory\n", mntname);
 525             vnode_put(vp);
 526             return (ENOTDIR);
 527         }
 528         if ((vnode_mountedhere(vp))) {
 529             vnode_put(vp);
 530             return (EBUSY);
 531         }
 532
 533         /*
 534          * Allocate and initialize the filesystem.
 535          */
 536         MALLOC_ZONE(mp, struct mount *, sizeof(struct mount),
 537                 M_MOUNT, M_WAITOK);
 538         bzero((char *)mp, sizeof(struct mount));
 539
 540         /* Initialize the default IO constraints */
 541         mp->mnt_maxreadcnt = mp->mnt_maxwritecnt = MAXPHYS;
 542         mp->mnt_segreadcnt = mp->mnt_segwritecnt = 32;
 543         mp->mnt_ioflags = 0;
 544         mp->mnt_realrootvp = NULLVP;
 545         mp->mnt_authcache_ttl = CACHED_LOOKUP_RIGHT_TTL;
 546
 547         mount_lock_init(mp);
 548         TAILQ_INIT(&mp->mnt_vnodelist);
 549         TAILQ_INIT(&mp->mnt_workerqueue);
 550         TAILQ_INIT(&mp->mnt_newvnodes);
 551
 552         (void)vfs_busy(mp, LK_NOWAIT);
 553         mp->mnt_op = &devfs_vfsops;
 554         mp->mnt_vtable = vfsp;
 555         mp->mnt_flag = 0;
 556         mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK;
 557         strlcpy(mp->mnt_vfsstat.f_fstypename, vfsp->vfc_name, MFSTYPENAMELEN);
 558         vp->v_mountedhere = mp;
 559         mp->mnt_vnodecovered = vp;
 560         mp->mnt_vfsstat.f_owner = kauth_cred_getuid(kauth_cred_get());
 561         (void) copystr(mntname, mp->mnt_vfsstat.f_mntonname, MAXPATHLEN - 1, 0);
 562 #if CONFIG_MACF
 563         mac_mount_label_init(mp);
 564         mac_mount_label_associate(ctx, mp);
 565 #endif
 566
 567         error = devfs_mount(mp, NULL, USER_ADDR_NULL, ctx);
 568
 569         if (error) {
 570             printf("devfs_kernel_mount: mount %s failed: %d\n", mntname, error);
 571             mp->mnt_vtable->vfc_refcount--;
 572
 573             vfs_unbusy(mp);
 574
 575             mount_lock_destroy(mp);
 576 #if CONFIG_MACF
 577             mac_mount_label_destroy(mp);
 578 #endif
 579             FREE_ZONE(mp, sizeof (struct mount), M_MOUNT);
 580             vnode_put(vp);
 581             return (error);
 582         }
 583         vnode_ref(vp);
 584         vnode_put(vp);
 585         vfs_unbusy(mp);
 586         mount_list_add(mp);
 587         return (0);
 588 }
 589
 590 struct vfsops devfs_vfsops = {
 591         devfs_mount,
 592         devfs_start,
 593         devfs_unmount,
 594         devfs_root,
 595         NULL,                           /* quotactl */
 596         devfs_vfs_getattr,
 597         devfs_sync,
 598         devfs_vget,
 599         devfs_fhtovp,
 600         devfs_vptofh,
 601         devfs_init,
 602         devfs_sysctl,
 603         NULL,
 604         {NULL}
 605 };